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July 30, 2014

July 30, 2014

Posted by **Maggie** on Tuesday, December 4, 2012 at 2:29pm.

A car of maass 1330kg is traveling at 28m/s. The driverapplies the brakes to bring the car to a rest over a distance of 79m. Calculate the retarding force acting on the car.

From this i can see that it gives me the

Mass:1330kg

the inicial velocity: 28m/s

and the distance: 79m

i'm trying to find the force, but i can't think of a formula using the known variables!!

- Physics HELP! -
**Henry**, Thursday, December 6, 2012 at 9:40pmF = ma. We know m, now we need to find "a".

V^2 = Vo^2 + 2a*d

a = (V^2-Vo^2)/2d.

a = (0-784)/158 = -4.96 m/s^2.

F = 1330*(-4.96) = -6600 N.

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